A man who claims to be a former associate of the 'Anger Management' star filed a police report in Los Angeles on October 18, alleging he is afraid the actor will murder him, based on a text message sent to a mutual friend.

The man said he had recently fallen out with Charlie and claims the actor later sent a text to a female pal that read: "I'll blow his head off with my Super 90."

The case is currently under investigation, and officers are planning to speak to the 47-year-old actor about the claims very soon.

While Charlie hasn't commented on the accusation, a friend has claimed the man is looking for money.

The source told gossip website TMZ.com: "The accuser is a dishonorably discharged military person with multiple probation violations who is trying to shake him down for money."

The news comes a few weeks after it was claimed Charlie - who has been in rehab five times and last hit the headlines for his extreme behavior in 2011 - has been spending up to $2,000 a day on cocaine over the past eight months.

A source said: "For at least the last eight months or so Charlie has been having a quarter to half an ounce of cocaine delivered to him every single day and was spending nearly $2,000 a day on drugs. Sometimes he'd even get two to three quarters of cocaine in one day."